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Description of business and basis of preparation of the consolidated financial statements - CPI (Details) | 2 Months Ended | 4 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Apr. 30, 2016 | Dec. 31, 2016 | Oct. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consumer Price Index |  |  |  |  |  |  |
Consumer Price Index (annual as a percent) | 7.80% | 16.60% | 16.90% | 11.90% | 24.80% | 36.30% | 20.60%
Consumer Price Index (3 years accumulated) |  |  |  |  | 104.90% | 103.70% | 65.80%
Number of years of accumulated price index |  |  |  |  | 3 years |  |
Internal Wholesale Price Index |  |  |  |  |  |  |
Internal Wholesale Price Index (annual as a percent) |  |  |  | 10.60% | 18.80% | 34.60% | 19.20%
Internal Wholesale Price Index (3 years accumulated) |  |  |  |  | 90.70% | 105.80% | 75.40%

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- References No definition available. + Details
Name: | teo_ConsumerPriceIndexAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
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- Definition Represents the duration of accumulated Price Index under both Consumer price index and wholesale price index. + References No definition available. + Details
Name: | teo_NumberOfYearsOfAccumulatedPriceIndex
Namespace Prefix: | teo_
Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Definition Represents the percentage of accumulated Consumer Price Index. + References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | num:percentItemType
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- Definition Represents the percentage of accumulated Wholesale Price Index. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Definition Represents the percentage of consumer price index over a period. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of internal wholesale price Index over a period. + References No definition available. + Details
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Namespace Prefix: | teo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration